I have made up a simple system to switch on a 12/24 volt light if the power goes off and it is dark. (If the project is completed but without the mains relay system it could be used for switching on a light automatically at night)WARNING!!!THIS PROJECT REQUIRES USE OF MAINS POWER, get a qualified pe...By: daniel9876
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from Instructables: exploring - technology - robots http://ift.tt/1wextsM
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